SAP Message PV496 - Enter a change request (correction number)

Diagnosis
You are attempting to save an object. Since the transport connectionfor PD objects is switched on, a dialog box appeared querying thenumber of the change request in the transport system.
You exited the dialog box without entering a valid change request(correction number), so the data could not be saved.

System Response
Data was not saved.

Procedure
Please enter a valid change request or cancel editing without saving.